<template>
  <div>
    <!-- 评论列表 -->
    <!-- 默认上来不检测，不然就会一直往下刷了 -->
    <div
      class="cmt-list"
      :class="{ 'art-cmt-container-1': isShow, 'art-cmt-container-2': !isShow }"
    >
      <van-list
        v-model="loading"
        :finished="finished"
        finished-text="没有更多了,请发表评论"
        @load="onLoad"
        :immediate-check="false"
      >
        <!-- 评论的 Item 项 -->
        <div class="cmt-item" v-for="item in commentList" :key="item.com_id">
          <!-- 头部区域 -->
          <div class="cmt-header">
            <!-- 头部左侧 -->
            <div class="cmt-header-left">
              <van-image :src="item.aut_photo" class="avatar">
                <template v-slot:error>图片在学习</template>
              </van-image>
              <!-- <img :src="item.aut_photo" alt="" class="avatar" /> -->
              <span class="uname">{{ item.aut_name }}</span>
            </div>
            <!-- 头部右侧 -->
            <div class="cmt-header-right">
              <van-icon
                name="like"
                size="16"
                color="red"
                v-if="item.is_liking === true"
                @click="like(true, item)"
              />
              <van-icon
                name="like-o"
                size="16"
                color="gray"
                v-else
                @click="like(false, item)"
              />
            </div>
          </div>
          <!-- 主体区域 -->
          <div class="cmt-body">
            {{ item.content }}
          </div>
          <!-- 尾部区域 -->
          <div class="cmt-footer">{{ formatDate(item.pubdate) }}</div>
        </div>
      </van-list>
    </div>

    <!-- 底部添加评论区域 - 1 -->
    <div class="add-cmt-box van-hairline--top" v-if="isShow === true">
      <van-icon name="arrow-left" size="0.48rem" @click="$router.back()" />
      <div class="ipt-cmt-div" @click="toggleShow">发表评论</div>
      <div class="icon-box">
        <van-badge
          :content="(totalCount = totalCount === 0 ? '' : totalCount)"
          max="99"
        >
          <van-icon
            name="comment-o"
            size="0.53333334rem"
            @click="comentClick"
          />
        </van-badge>
        <van-icon name="star-o" size="0.53333334rem" />
        <van-icon
          name="share-o"
          size="0.53333334rem"
          @click="showShare = true"
        />
      </div>
    </div>

    <!-- 底部添加评论区域 - 2 -->
    <div class="cmt-box van-hairline--top" v-else>
      <textarea
        placeholder="友善评论、理性发言、阳光心灵"
        v-focus
        @blur="blurEv"
        v-model.trim="comTxt"
      ></textarea>
      <van-button
        type="default"
        :disabled="comTxt.length === 0"
        @click="sendCom"
        >发布</van-button
      >
    </div>

    <!-- 分享 -->
    <!-- 分享功能实现思路： -->
    <!-- 向相应平台调用接口 -->
    <van-share-sheet
      v-model="showShare"
      title="立即分享给好友"
      :options="options"
      @select="onSelect"
    />
  </div>
</template>

<script>
import {
  getComment,
  commentLiking,
  commentDisLiking,
  sendComment,
} from "@/api/index";
import { timeAgo } from "@/utils/date";
import { Toast } from "vant";
export default {
  data() {
    return {
      offset: null,
      commentList: [],
      isShow: true,
      totalCount: 0,
      comTxt: "",
      loading: false,
      finished: false,
      lastId: null,
      showShare: false,
      options: [
        { name: "微信", icon: "wechat" },
        { name: "微博", icon: "weibo" },
        { name: "复制链接", icon: "link" },
        { name: "分享海报", icon: "poster" },
        { name: "二维码", icon: "qrcode" },
      ],
    };
  },
  async created() {
    let res = await getComment({
      id: this.$route.query.art_id,
    });
    this.commentList = res.data.data.results;
    this.totalCount = res.data.data.total_count;
    this.lastId = res.data.data.last_id;
    if (res.data.data.results.length === 0) {
      this.finished = true;
    }
  },
  methods: {
    formatDate: timeAgo,
    async like(val, comm) {
      if (val === true) {
        comm.is_liking = false;
        await commentDisLiking(comm.com_id);
      } else {
        comm.is_liking = true;
        await commentLiking(comm.com_id);
      }
    },
    toggleShow() {
      this.isShow = false;
    },
    comentClick() {
      // let scroolTop = document.querySelector(".article-container").scrollHeight;
      // console.log(scroolTop);
      // window.scrollTo(0, scroolTop);
      document.querySelector(".like-box").scrollIntoView({
        behavior: "smooth",
      });
    },
    async sendCom() {
      let res = await sendComment(this.$route.query.art_id, this.comTxt);
      this.commentList.unshift(res.data.data.new_obj);
      this.totalCount++;
      this.comTxt = "";
      this.comentClick();
    },
    // 因为失焦便会隐藏评论，所以异步使消息先发出去，在进行隐藏
    blurEv() {
      setTimeout(() => {
        this.isShow = true;
      }, 0);
    },
    async onLoad() {
      if (this.commentList.length > 0) {
        let res = await getComment({
          id: this.$route.query.art_id,
          offset: this.lastId,
        });
        this.commentList = [...this.commentList, ...res.data.data.results];
        this.totalCount = res.data.data.total_count;
        this.lastId = res.data.data.last_id;
        if (res.data.data.last_id === null) {
          this.finished = true;
        }
        this.loading = false;
      } else {
        this.loading = false;
      }
    },
    onSelect(option) {
      Toast(option.name);
      this.showShare = false;
    },
  },
};
</script>

<style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}
/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 46px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}
// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}
.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}
// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>